Kindly solve this question by cross multiplication method. Ritu can row downstream 20 km in 2 hours and upstream 4 kn in 2 hours. Find her speed of rowing in still water and speed of the current
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Answer:
let the speed of boat in still water be 'x'
let the speed of stream be 'y'
downstream = x+y
upstream = x-y
20/x+y = 2
20 = 2(x+y)
20/2=x+y
10=x+y ---------------------(i)
4/x-y=2
4=2(x-y)
4/2=x-y
2=x-y
x=2+y---------------------(ii)
substituting (ii) in (i)
10=x+y
10=2+y+y
10=2+2y
10-2=2y
8=2y
y=8/2
∴y=4
now x=2+y
x=2+4
∴x=6
∴speed of boat in still water = 6km/hr
speed of stream = 4km/hr
khushi12532:
It's to be answered by cross multiplication method :/
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